Imac gpu problem

[MDY]

I replaced gpu on this imac with new one 2019 and it works only 2 weeks. Then I replaced one more time with 2025 dc 16+ and it works only 2 weeks again. I attached pictures. Any idea whats wrong again? Bad gpus? Bad vram?

 

[dukefawks]

I've never seen 2025 chips with 2016 date code. Pictures plz. What was date code on 2019 chips?

 

[MDY]

Sorry, I was confused with 9000 chip datacode.
2019 chip was 0937 and it works 2 weeks.

2025 chip is 1141 datacode by Golden Chipset

 

[dukefawks]

0937 is known garbage. I have no idea about the 1141 ones, I bet they are garbage too. I had 2025 chip with date code 1512 from SEE, they are good so far.

 

[MDY]

I heated GPU and no reaction. What is next? To replace GPU again ot to replace vram?

 

[dukefawks]

Get the 1512 date code 2025 GPUs, all the rest is garbage.

 

[Gurmon]

Unfortunately 1512 date code 2025 GPU are now mostly garbage too. I've given up on the 2009 iMacs. shame really,

 

[dukefawks]

Not had issues with the 1512 ones yet from SEE. Just got 6 more last week, not used those yet.